Have tried both Lenovo and Linksys (USB-A, RTL) - in both cases they would have issues and disappear after hours or days after startup. I can not tell you for c

Have tried both Lenovo and Linksys (USB-A, RTL) - in both cases they would have issues and disappear after hours or days after startup. I can not tell you for certain that it's purely an issue with the USB Ethernet adapters and not something else in the stack (Armbian Bullseye). Since it's built in-house, why are you relying on retrofitted USB dongles if reliable Ethernet connectivity is important? Unfeasible to make a revision with a port? Anyway, if I were you I would probably just go ahead and buy one each of the top handful of contenders and try them out myself - they're not expensive and it makes sure that it really works for you, and if not, where the problem lies. If you have the same issue on several adapters with different chipsets, well...